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Table 6 Concentrations of trace metals in River and reservoir sediment and its comparison with ERL-ERM ranges of SQGs (mg/kg, dry wt)

From: Distribution and ecological risk assessment of trace metals in surface sediments from Akaki River catchment and Aba Samuel reservoir, Central Ethiopia

Element

ERL-ERM range

This study range

Percentage of sampling sites

< ERL-ERM range

Between ERL-ERM range

> ERL-ERM range

Dry season

 Cd

1.2–9.6

2.1–2.9

–

100

–

 Cr

81–370

16.2–43.7

100

–

–

 Cu

34–270

1.6–15.3

100

–

–

 Pb

46.7–218

124.4–256.4

–

91

9

 Ni

20.9–51.6

15.6–36.2

36

64

–

 Zn

150–410

4.0–110.0

100

–

–

Rainy season

 Cd

1.2–9.6

2.5–3.1

–

100

–

 Cr

81–370

18.3–29.4

100

–

–

 Cu

34–270

2.1–6.2

100

–

–

 Pb

46.7–218

101.4–133.7

–

100

–

 Ni

20.9–51.6

14.6–24.0

55

45

–

 Zn

150–410

4.8–38.2

100

–

–